The first sentence is: Einstein said, I don't know when the third world war was, but I know that the weapons of the fourth world war must be stones and branches. This sentence actually means that science and technology are too powerful, and the weapons of war are extremely devastating. In the movie, it is the nether. It is invincible. You will die if you touch people. War + powerful technology = painful war cost, the core idea of the movie. It is here to remind, anti-war. The second sentence is what the male protagonist said after discovering the laboratory: I found that science cannot solve (explain) everything. This also confirms the theme. Science is only responsible for how to make powerful weapons, and cannot limit how it is controlled and used. This is also the helplessness of science. War is ruthless. Seeing science being used in this way, he, as an engineer ( The scientist was also very painful in his heart, so he finally destroyed all the evidence, because he was discovered by the military or the country, and must imitate it to deal with his enemy, but what he wanted in his heart was peace.
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